Colloidal synthesis of NiMn2O4 nanodisks decorated reduced graphene oxide for electrochemical applications

摘要

This work describes the preparation of spinel NiMn2O4 nanodisks decorated reduced graphene oxide (rGO) via low-temperature colloidal solution method and analyzes their performances as electro-active electrode for electrochemical sensor and supercapacitors. The morphological analysis revealed the well-decorated spinel NiMn2O4 nanodiks over the rGO surfaces. The crystalline, structure, and composition of spinel NiMn(2)O(4)nano-disks decorated rGO was studied and extensively used as electrode materials for electrochemical applications. For sensing measurements, the NiMn2O4/rGO composite modified GCE expressed the high sensitivity of 78.56 mA. mM(-1).cm(-2) with an excellent linear dynamic range of 1.0 mu M-500.0 mu M towards the acetylacetone chemical. The electrode prepared by NiMn2O4/rGO composite was applied to fabricate the double layer electrochemical supercapacitors. NiMn2O4/rGO electrode showed a reasonably high specific capacitance of 356 F g(-1) at a current density of 0.5 Ag-1 in 1 M Na2SO4 electrolyte. The fabricated supercapacitor exhibited the admirable rate capability by maintaining 86% from initial capacity after 5000 cycles. The prepared NiMn2O4/rGO composite and obtained results are the promising electrode materials for achieving high-performance sensing and supercapacitors.